Over-temperature indicator device for freezers

Details Over-temperature indicator device for freezers Over-temperature indicator device for freezers

1985-12-31

1987-03-17

Frankfort, Charles

Signals and indicators

Indicators

Temperature responsive or compensating means

116215, 116221, 116281, 62128, G01K 102

Patent

active

046498540

ABSTRACT:
An over-temperature indicator for freezers includes an indicator pin slidable mounted within a cylindrical housing in which is mounted a bistable bimetal thermostat disk which is engaged by a magnet mounted to an end of the indicator pin. A cup shaped insulator is mounted over a substantial portion of the cylindrical housing to provide a thermal time delay. An over-temperature condition triggers the bistable bimetal disk to snap, causing the magnet to release and enabling gravity to urge the indicator pin into an indicating position.

REFERENCES:
patent: 1526315 (1925-02-01), Bradshaw
patent: 2362424 (1944-11-01), Walsh
patent: 2375859 (1945-05-01), Marcy
patent: 2843076 (1958-07-01), Cook et al.
patent: 3117550 (1964-01-01), Cole
patent: 3870983 (1975-03-01), Kato et al.
patent: 3898860 (1975-08-01), Shepherd et al.

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